<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			html{
				font-size: 10px;
			}
			@media only screen and (min-width:300px ) {
				html{
					font-size: 15px;
				}
			}
						@media only screen and (min-width:600px ) {
				html{
					font-size: 20px;
				}
			}
			p{
				width: 10rem;
				height: 3rem;
				background: green;
				text-align: center;
				color: white;
				line-height: 3rem;
				
			}
		</style>
	</head>
	<body>
		<p>按钮</p>
	</body>
</html>
